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Hi, for the 300x300x300 build volume with double Z, wich type of extrusions is good what is works with cheap aliexpress nuts and etx?

There is 2 different types for each:

  • 30x30L I type slot 6
  • 30x30 B type slot 8

and for 20x20:

  • 20x20 B type slot 6
  • 20x20 I type slot 5

Which ones should I choose?